text: A biocathode is a cathode used in a microbial electrolysis cell during electromethanogenesis that utilizes microorganisms to catalyze the process of accepting electrons and protons from the anode. A biocathode is usually made of a cheap material, such as carbon or graphite, like the anode in the MEC. The microbe population that is placed on the biocathode must be able to pick up electrons from the electrode material (carbon or graphite) and convert those electrons to hydrogen.